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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c129a603f90a6b64c188e2567b02a57efee6db55c1c1032e72185fef695557' 
  AND token = 'n+vYycs/pM9zemTncXwhQGVh+6YCFDr0tcIVqg6Ld5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}